// Initialize Tracker
this.tracker = new AR.Tracker("assets/myfirstapp.wtc", {
    onLoaded: this.worldLoaded
});

// Create overlay for page one
var imgOne = new AR.ImageResource("assets/starwars.png");
var overlayOne = new AR.ImageDrawable(ironman, 1, {
    offsetX: -0.15,
    offsetY: 0
});
var pageOne = new AR.Trackable2DObject(this.tracker, "ironman", {
    drawables: {
        cam: overlayOne
    }
});